1 /* Copyright (C) 2009-2021 Free Software Foundation, Inc.
2    This file is part of the GNU C Library.
3 
4    The GNU C Library is free software; you can redistribute it and/or
5    modify it under the terms of the GNU Lesser General Public
6    License as published by the Free Software Foundation; either
7    version 2.1 of the License, or (at your option) any later version.
8 
9    The GNU C Library is distributed in the hope that it will be useful,
10    but WITHOUT ANY WARRANTY; without even the implied warranty of
11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12    Lesser General Public License for more details.
13 
14    You should have received a copy of the GNU Lesser General Public
15    License along with the GNU C Library.  If not, see
16    <https://www.gnu.org/licenses/>.  */
17 
18 #include <stdio.h>
19 #include <signal.h>
20 #include <sysdep.h>
21 #define __longjmp ____longjmp_chk
22 #define CHECK_SP(sp)							      \
23   do {									      \
24     register unsigned long this_sp asm ("sp");				      \
25     if ((unsigned long) (sp) < this_sp)					      \
26       {									      \
27 	stack_t oss;							      \
28 	int result = INTERNAL_SYSCALL_CALL (sigaltstack, NULL, &oss);         \
29 	if (!INTERNAL_SYSCALL_ERROR_P (result)				      \
30 	    && ((oss.ss_flags & SS_ONSTACK) == 0			      \
31 		|| ((unsigned long) oss.ss_sp + oss.ss_size		      \
32 		    - (unsigned long) (sp)) < oss.ss_size))		      \
33 	  __fortify_fail ("longjmp causes uninitialized stack frame");	      \
34       }									      \
35   } while (0)
36 
37 #include <__longjmp.c>
38